Tusa RS1207 Manual Del Usuario página 8

Check-up and repairs
Regulator will provide optimum performance only if used properly and
inspected regularly. Normal wear parts such as diaphragm, seat, exhaust
valve, o'rings, mouthpiece must be inspected and changed regularly.
Every year, preferably before the start of the diving season, the regulator
must be taken to a TUSA authorized technician for annual service.